The past eight episodes have seen Lady Edith (Laura Carmichael) bring her secret daughter into the family, Tom (Allen Leech) debate a move to America and Lady Rose (Lily James) get married — and outside the faith, to boot.

In Sunday’s 90-minute season finale (9 p.m. on PBS), the whole Crawley clan gets a change of scenery when they travel to the home of Rose’s new in-laws, Lord and Lady Sinderby, for a shooting party.

Matthew Goode (“The Good Wife,” “The Imitation Game”) guest stars in the episode as Henry Talbot, a handsome neighbor who crashes the outing and gets paired with Lady Mary (Michelle Dockery) in the shooting party.

Doubtless, the eldest Crawley daughter won’t make it easy, as Henry is quickly treated to some of her trademark coldness: When he catches her casting a disapproving glance his way, she sharply replies, “I shall scowl if I think you deserve it.”

Drama unfolds with the characters downstairs as well, with Anna (Joanne Froggatt) in jail for the murder of Mr. Green, Thomas (Rob James-Collier) up to another scheme and Carson (Jim Carter) pressing Mrs. Hughes (Phyllis Logan) on his plan to open a bed-and-breakfast.

And as the Dowager Countess (Maggie Smith) and Isobel (Penelope Wilton) weigh their own respective suitors — Prince Kuragin (Rade Serbedzija) and Lord Merton (Douglas Reith) — someone at Downton is in for a romantic marriage proposal.

Ratings for “Downton Abbey” — the most popular series in PBS history — have been on par with last season, which averaged over 8 million viewers.

The British drawing-room drama, which airs on ITV in the UK, is already renewed for a sixth season.